#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int fun(int n)
{
	int x= 1, k;
	if(n== 1)
		return x;
	for (k= 1; k< n; ++k)
		x= x+ fun(k) * fun(n- k);
	return x;
}
int main()
{
	if ('\0' == 0)putchar('X');
	if ('\0' == 0)putchar('Y');
	if ('a' > 'b')putchar('Z');


	printf("\n%d", fun(5));
	printf("\n");
}